Cylinder Head Runner Volumes - Page 2

Rich Biebel · 12-20-2008, 07:23 PM

I don't run Stock any longer for my own reasons and I won't bore you all with why that is so. I have poured a number of intake runners in my engine shop days. Mostly big and small block Chevys that were untouched. I also poured the heads that were on my last stocker...a late model LT-1 with aluminum heads. Lets just say that my experience is that all the heads I poured were not near the posted NHRA numbers, How did they get those numbers in the first place one would have to ask. Especially if the rules say NO port modifications allowed including acid porting or what I might call "selective rusting techniques". Aluminum does not rust so I also have to ask how a head spec can be close to 10 CC's larger than an unmolested head? The heads used to establish the accepted numbers were modified in my opinion. That is old news......

12-20-2008, 07:23 PM	#27
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Cylinder Head Runner Volumes I don't run Stock any longer for my own reasons and I won't bore you all with why that is so. I have poured a number of intake runners in my engine shop days. Mostly big and small block Chevys that were untouched. I also poured the heads that were on my last stocker...a late model LT-1 with aluminum heads. Lets just say that my experience is that all the heads I poured were not near the posted NHRA numbers, How did they get those numbers in the first place one would have to ask. Especially if the rules say NO port modifications allowed including acid porting or what I might call "selective rusting techniques". Aluminum does not rust so I also have to ask how a head spec can be close to 10 CC's larger than an unmolested head? The heads used to establish the accepted numbers were modified in my opinion. That is old news...... __________________ Rich Biebel S/C 1479 Stock 147R